Improvement in preventing inorfxtation  of steam



- No. fi2,8'7 8. PATENTED MAR. 12,1861.

. G. T. PARRY. PREVENTING INOBUSTATATION 0F STEAM BOILERS.

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Letters Patent No. 62,878, dated March 12, 1867.

IMPROVEMENT IN PsEvsnTme-mciwsmnon or sTEAuBoILERs.

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TO ALL, WHOM IT MAY. conenmh V o I Be it known that I, GEORGE'T. PARRY, of the city and county of Philadelphia, and State-of- Pennsylvania, have 'inventcd a new anduseful Improvement in t'lie'iviodc of Preventing the Incrnstation of Steam Boilers and I do hereby declarel'that the following is a full, clear, and exact description of the same, reference being bad to the annexed drawings, making part of'this specification, in which- Figure 1 is a side elevation showing part of the :interior by vertical section and Figure 2 is a top view 'of the lower-part of the bulb.

'In both figures I employ the same letters in the indication of parts which are identical. I The action of the apparatus described in Letters Patent issued 'to me, and dated October 31, A. D. 1865,

as heretofore constructed-and applied, has been always slow in detaching the already xisting scale in old boilers to which it has been applied; particularly is this: thecase in boilers used forthe generation of. steam of low pressure. The'apparatu's' being suspended within the steam chamber of the'generatonis not in any degree within the control of the engineer. I have recently discovered that similar effects maybeproduced by electricity A generated without the boiler, and then ce carfiedthrou'ghithe medium of conductors,'into the boiler, where, acting upon the surfaceof the boiler and flues, 'it prevents the formation of scale, and will detach that which may havealready formed. One form of apparatus by-whichthis resulti;is.'efi'ccted I will sl1ow,.' which is at all timessnl I ject to the observationand 'within the control. of the enginefl who' may regulate its action as desired. The A generation of electricityby'the passage of a jet of steain over an insulated brush of points is well known,- and is notclaiined as my invention, which consists in directing electricity thus-generated withoutthe boilerintothe same for the purpose of preventing the formation of scale and] detaching that which may be already forrngd.

l. ;A..iss.the boiler-headprsother part eithe ahellmflaboihinBa tryjeock whichshonld beinscrtcd-abovmhut.

nearthe ordinary water level, as the elcctrical elfect of dry steam is" greater than, that of wet steam, O is a screw by which the valved), passing through it, is pressed against or released from the valve-'seatlil. When 3 this valveiis opened thesteam jets from thc'pipo F, entering the upper cnd of the bulb G. This bulb is hollow, and formed in' two parts, G and G, bolted together, so as to form a steam-tight joint. .A flange i's'for'rned within the lower art G or a rin is fitted within the same .su "ortin 'the insvardl inclined ointed wires H. .Th'ese P a g 7 PP a y P 7 wires are madelof iron or steel, preferably the latter. Experiments heretofore made indicate that these-wires should be magnetized, andin such mannerthat the points will attract the south pole of the magnetic needle. I

therefore use pointed steel wires permanently niagnetized as above. The lower part of the section G ofltlie bulb is extended, forming a neck, which is enclosed by a glass insulator, M. M represents plasterof Paris poured around the neck of the bulb. to attach it to the insulator. The bulb and insulator are sustained by the eye-bolt whichis attached to the boiler, the eye enclosing the insulator. The steam jetting from the pipe F,

enters the bulb and impinges against the points H md passing throngh the bulb escapes at the orifice 0', thus exciting electricity which, passing from the ball or point I to K, is conducted into the boiler; whence difi'using itself over the surfaces it escapes through a copper wireinscrted into the boiler at its'oppositecxtremity, and

by its action detaching scale already formed and preventing the deposit of new scale. The electricity thus generated is subject to the discretionary control of the engineer, who may regulate at will its intensity and duration. It is evident that-the form of this apparatus may be indefinitely varied asnlso the mode of applying the insulators. I do not therefore confine my claim to the form of construction here set forth, but without regard to the peculiar form and precise arrangement of the respective parts. What I do claim as my invention,

and desire to secure by Letters Patent, is-- V v v 1. The mode, substantially as described, of removing the'scale from and preventing the incrustation of boilers,

by means of electricity generated withoutthc boilers by jets of steam impinging upon one or more points, or

equivalent means, said electricity being conducted into the boiler by suitable means.-

2. The combination of the try-cock B and the insulated brush of points H. set in the bulb G, or its cquiva lent, when connected by a suitable conductor, K withthc shell of the boiler, and arranged to operatesubstantially in the rnanncr and for the purpose set forth.

In testimony whereof I have signed my name so this specification in the presence ofitwo subscribing witnesses.

GEORGE '1. many.

'Witnesscs:

R. Mason, 0, F. Omnsnn. 

